Best deal on a complete gun was in about 8 years ago on a Dan Wesson 715, with 3 grips, in near mint condition, custom sights, some parts, paperwork, for $269. I kept wondering why no one was bidding it up, what was I missing? Somehow, only two of us were bidding on it, and I ended up getting it. I was worried until I saw it when I picked it up at the FFL.
Best deal ever was out in Arizona someplace, at a gun shop that was closing up due to the owner terminal illness. I asked him, "Do you have any Dan Wesson stuff?". He hands me this box, weighed about 20 pounds, and says, "$50, it's yours!". I handed it over and inside was a bunch of new and slightly used barrels, shrouds, parts, in SS and blue, and a blued frame that appeared to be brand new (In a box with vapor paper). After we left, I assembled a complete gun in my friend's truck while we ate at Burger King. I ended up selling a lot of the extra barrels and parts for a huge profit, and had the gun for about 20 years before I sold it when I needed money.